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Third, irregular plural nouns may be regularized and use the –s morpheme. This may happen when the plural is not otherwise marked (e.g., sheeps for sheep), when the plural is typically marked with a morpheme other than –s (e.g., oxes for oxen), or when the plural is typically formed through vowel mutation (e.g., foots for feet).
English plurals include the plural forms of English nouns and English determiners. This article discusses the variety of ways in which English plurals are formed from the corresponding singular forms, as well as various issues concerning the usage of singulars and plurals in English. For plurals of pronouns, see English personal pronouns.
Regular verbs have identical past tense and past participle forms in -ed, but there are 100 or so irregular English verbs with different forms (see list). The verbs have, do and say also have irregular third-person present tense forms (has, does /dʌz/, says /sɛz/).
The pronouns have irregular plurals, as in "I" versus "we", because they are ancient and frequently used words going back to when English had a well developed system of declension. English verbs distinguish singular from plural number in the third person present tense ("He goes" versus "They go").
Regular in past tense and sometimes in past participle. must – (no other forms) Defective: Originally a preterite; see English modal verbs: need (needs/need) – needed – needed: Weak: Regular except in the use of need in place of needs in some contexts, by analogy with can, must, etc; [4] see English modal verbs: ought – (no other forms ...
In English, the most common formation of plural nouns is by adding an -s suffix to the singular noun. (For details and different cases, see English plurals.) Just like in English, noun plurals in French, Spanish, and Portuguese are also typically formed by adding an -s suffix to the lemma form, sometimes combining it with an additional vowel ...
Some English words of Latin origin do not commonly take the Latin plural, but rather the regular English plurals in -(e)s: campus, bonus, and anus; while others regularly use the Latin forms: radius (radii) and alumnus (alumni).
This means that any regular Latin verb can be conjugated in any person, number, tense, mood, and voice by knowing which of the four conjugation groups it belongs to, and its principal parts. A verb that does not follow all of the standard conjugation patterns of the language is said to be an irregular verb.